At an axial load of 26 kN, a 35-mm-wide by 15-mm-thick polyimide polymer bar elongates 2.9 mm while the bar width contracts 0.2 mm. The bar is 160 mm long. At the 26-kN load, the stress in the polymer bar is less than its proportional limit. Determine (a) the modulus of elasticity. (b) Poisson's ratio. (c) the change in the bar thickness.

Materials Science And Engineering Properties
1st Edition
ISBN:9781111988609
Author:Charles Gilmore
Publisher:Charles Gilmore
Chapter6: Introduction To Mechanical Properties
Section: Chapter Questions
Problem 6.4P
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At an axial load of 26 kN, a 35-mm-wide by 15-mm-thick polyimide polymer bar elongates 2.9 mm while the bar width contracts 0.23
mm. The bar is 160 mm long. At the 26-kN load, the stress in the polymer bar is less than its proportional limit.
Determine
(a) the modulus of elasticity.
(b) Poisson's ratio.
(c) the change in the bar thickness.
Answers:
(a) E=
(b)
V =
(c) Athickness=
i
i
i
GPa
mm
Transcribed Image Text:At an axial load of 26 kN, a 35-mm-wide by 15-mm-thick polyimide polymer bar elongates 2.9 mm while the bar width contracts 0.23 mm. The bar is 160 mm long. At the 26-kN load, the stress in the polymer bar is less than its proportional limit. Determine (a) the modulus of elasticity. (b) Poisson's ratio. (c) the change in the bar thickness. Answers: (a) E= (b) V = (c) Athickness= i i i GPa mm
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